scholarly journals Dynamic Behavior of CO2 in a Wellbore and Storage Formation: Wellbore-Coupled and Salt-Precipitation Processes during Geologic CO2 Sequestration

Geofluids ◽  
2018 ◽  
Vol 2018 ◽  
pp. 1-20 ◽  
Author(s):  
Jize Piao ◽  
Weon Shik Han ◽  
Sungwook Choung ◽  
Kue-Young Kim
Keyword(s):  
Co2 Sequestration ◽  
Flow System ◽  
Initial Pressure ◽  
Sensitivity Analyses ◽  
Salt Precipitation ◽  
Flow Process ◽  
Wellbore Flow ◽  
Geologic Co2 Sequestration ◽  
Screen Interval ◽  
And Storage

For investigating the wellbore flow process in CO2 injection scenarios, coupled wellbore-reservoir (WR) and conventional equivalent porous media (EPM) models were compared with each other. In WR model, during the injection, conditions for the wellbore including pressure and temperature were dynamically changed from the initial pressure (7.45–8.33 MPa) and temperature (52.0–55.9°C) of the storage formation. After 3.35 days, the wellbore flow reached the steady state with adiabatic condition; temperature linearly increased from the well-head (35°C) to the well-bottom (52°C). In contrast, the EPM model neglecting the wellbore process revealed that CO2 temperature was consistently 35°C at the screen interval. Differences in temperature from WR and EPM models resulted in density contrast of CO2 that entered the storage formation (~200 and ~600 kg/m3, resp.). Subsequently, the WR model causing greater density difference between CO2 and brine revealed more vertical CO2 migration and counterflow of brine and also developed the localized salt-precipitation. Finally, a series of sensitivity analyses for the WR model was conducted to assess how the injection conditions influenced interplay between flow system and the localized salt-precipitation in the storage formation.

scholarly journals Carbon Capture and Storage: A Review of Mineral Storage of CO2 in Greece

2018 ◽  
Vol 10 (12) ◽  
pp. 4400 ◽  
Author(s):  
Kyriaki Kelektsoglou
Keyword(s):  
Co2 Sequestration ◽  
Carbon Capture ◽  
Power Plants ◽  
Carbon Capture And Storage ◽  
Mineral Carbonation ◽  
Current State ◽  
Novel Method ◽  
Carbon Dioxide Co2 ◽  
Carbonate Materials ◽  
And Storage

As the demand for the reduction of global emissions of carbon dioxide (CO2) increases, the need for anthropogenic CO2 emission reductions becomes urgent. One promising technology to this end, is carbon capture and storage (CCS). This paper aims to provide the current state-of-the-art of CO2 capure, transport, and storage and focuses on mineral carbonation, a novel method for safe and permanent CO2 sequestration which is based on the reaction of CO2 with calcium or magnesium oxides or hydroxides to form stable carbonate materials. Current commercial scale projects of CCS around Europe are outlined, demonstrating that only three of them are in operation, and twenty-one of them are in pilot phase, including the only one case of mineral carbonation in Europe the case of CarbFix in Iceland. This paper considers the necessity of CO2 sequestration in Greece as emissions of about 64.6 million tons of CO2 annually, originate from the lignite fired power plants. A real case study concerning the mineral storage of CO2 in Greece has been conducted, demonstrating the applicability of several geological forms around Greece for mineral carbonation. The study indicates that Mount Pindos ophiolite and Vourinos ophiolite complex could be a promising means of CO2 sequestration with mineral carbonation. Further studies are needed in order to confirm this aspect.

scholarly journals Economic Conditions for Developing Hydrogen Production Based on Coal Gasification with Carbon Capture and Storage in Poland

Energies ◽  
2020 ◽  
Vol 13 (19) ◽  
pp. 5074
Author(s):  
Radosław Kaplan ◽  
Michał Kopacz
Keyword(s):  
Carbon Capture ◽  
Coal Gasification ◽  
Net Present Value ◽  
Carbon Capture And Storage ◽  
Economic Assessment ◽  
Free Cash Flow ◽  
Sensitivity Analyses ◽  
Capital Expenditures ◽  
Hard Coal ◽  
And Storage

This study documents the results of economic assessment concerning four variants of coal gasification to hydrogen in a shell reactor. That assessment has been made using discounting methods (NPV: net present value, IRR: internal rate of return), as well as indicators based on a free cash flow to firm (FCFF) approach. Additionally, sensitivity analysis has been carried out, along with scenario analysis in current market conditions concerning prices of hard coal, lignite, hydrogen and CO2 allowances, as well as capital expenditures and costs related to carbon capture and storage (CCS) systems. Based on NPV results, a negative economic assessment has been obtained for all the analyzed variants varying within the range of EUR −903 to −142 million, although the variants based on hard coal achieved a positive IRR (5.1–5.7%) but lower than the assumed discount rates. In Polish conditions, the gasification of lignite seems to be unprofitable, in the assumed scale of total investment outlays and the current price of coal feedstock. The sensitivity analyses indicate that at least a 20% increase of hydrogen price would be required, or a similar reduction of capital expenditures (CAPEX) and costs of operation, for the best variant to make NPV positive. Analyses have also indicated that on the economic basis, only the prices of CO2 allowances exceeding EUR 40/Mg (EUR 52/Mg for lignite) would generate savings due to the availability of CCS systems.

scholarly journals Sarin and Air Permeation Through a Nanoporous Graphene

MRS Advances ◽  
2020 ◽  
Vol 5 (27-28) ◽  
pp. 1475-1482
Author(s):  
Marco A. Maria ◽  
Alexandre F. Fonseca
Keyword(s):  
Room Temperature ◽  
Initial Pressure ◽  
Chemical Warfare Agent ◽  
The Other ◽  
Graphene Nanosheet ◽  
Different Temperatures ◽  
Nanoporous Graphene ◽  
Dynamics Simulations ◽  
And Storage ◽  
Air Permeation

ABSTRACTSarin gas is a dangerous chemical warfare agent (CWA). It is a nerve agent capable of bringing a person to death in about 15 minutes. A lethal concentration of sarin molecules in air is about 30 mg/m3. Experimental research on this gas requires very careful safety protocols for handling and storage. Therefore, theoretical and computational studies on sarin gas are very welcome and might provide important safe guides towards the management of this lethal substance. In this work, we investigated the interactions between sarin, air and nanoporous graphene, using tools of classical molecular dynamics simulations. Aiming to cast some light in the possible sarin selective filtration by graphene, we designed a bipartite simulation box with a porous graphene nanosheet placed at the middle. Sarin and air molecules were initially placed only on one side of the box so as to create an initial pressure towards the passage of both to the other side. The box dimensions were chosen so that the hole in the graphene was the only possible way through which sarin and air molecules can get to the other side of the box. The number of molecules that passed through the hole in graphene was monitored during 10 ns of simulation and the results for different temperatures were compared. The results show that, as far as the size of the holes are small, van der Waals forces between graphene and the molecules play a significant role on keeping sarin near graphene, at room temperature.

scholarly journals Effects of sulfate and magnesium on cement degradation under geologic CO2 sequestration conditions

2017 ◽  
Vol 63 ◽  
pp. 118-125
Author(s):  
Jilong Guo ◽  
Bo Cao ◽  
Carl I. Steefel ◽  
Jiawei Chen ◽  
Yandi Hu
Keyword(s):  
Co2 Sequestration ◽  
Geologic Co2 Sequestration

scholarly journals Sedimentary reservoir oxidation during geologic CO2 sequestration

2015 ◽  
Vol 155 ◽  
pp. 30-46 ◽  
Author(s):  
Laura N. Lammers ◽  
Gordon E. Brown ◽  
Dennis K. Bird ◽  
Randal B. Thomas ◽  
Natalie C. Johnson ◽  
...  
Keyword(s):  
Co2 Sequestration ◽  
Geologic Co2 Sequestration
Sign in / Sign up

Export Citation Format

Share Document